mirror of
https://github.com/oarkflow/mq.git
synced 2025-10-05 16:06:55 +08:00
395 lines
10 KiB
Go
395 lines
10 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"strings"
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"time"
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)
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const (
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PageType = "page"
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FunctionType = "function"
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)
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type Node interface {
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ProcessTask(ctx context.Context, task *Task) Result
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GetNodeType() string
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}
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type Result struct {
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NextNodeID string
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Message string
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Error error
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}
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type Task struct {
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ID string
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CurrentNodeID string
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Inputs map[string]string
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FinalResult string
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}
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type PageNode struct {
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ID string
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Content string
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}
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func (n *PageNode) ProcessTask(ctx context.Context, task *Task) Result {
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return Result{Message: n.Content}
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}
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func (n *PageNode) GetNodeType() string {
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return PageType
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}
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type FunctionNode struct {
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ID string
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Func func(task *Task) Result
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}
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func (n *FunctionNode) ProcessTask(ctx context.Context, task *Task) Result {
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return n.Func(task)
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}
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func (n *FunctionNode) GetNodeType() string {
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return FunctionType
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}
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type Graph struct {
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Nodes map[string]Node
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Edges map[string][]string
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}
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func NewGraph() *Graph {
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return &Graph{
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Nodes: make(map[string]Node),
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Edges: make(map[string][]string),
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}
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}
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func (g *Graph) AddNode(node Node) {
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switch n := node.(type) {
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case *PageNode:
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g.Nodes[n.ID] = n
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case *FunctionNode:
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g.Nodes[n.ID] = n
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}
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}
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func (g *Graph) AddEdge(fromID, toID string) {
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g.Edges[fromID] = append(g.Edges[fromID], toID)
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}
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type TaskManager struct {
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tasks map[string]*Task
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graph *Graph
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}
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func NewTaskManager(graph *Graph) *TaskManager {
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return &TaskManager{
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tasks: make(map[string]*Task),
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graph: graph,
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}
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}
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func (tm *TaskManager) GetTask(taskID string) (*Task, bool) {
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task, exists := tm.tasks[taskID]
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return task, exists
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}
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func (tm *TaskManager) StartTask() *Task {
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taskID := generateTaskID()
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task := &Task{
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ID: taskID,
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CurrentNodeID: "customRegistration",
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Inputs: make(map[string]string),
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}
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tm.tasks[taskID] = task
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return task
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}
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func (tm *TaskManager) UpdateTask(task *Task) {
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tm.tasks[task.ID] = task
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}
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func (tm *TaskManager) GetNextNode(task *Task) (Node, bool) {
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if task == nil {
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return nil, false
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}
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edges, _ := tm.graph.Edges[task.CurrentNodeID]
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if len(edges) > 0 {
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nextNodeID := edges[0]
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nextNode, exists := tm.graph.Nodes[nextNodeID]
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if exists {
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return nextNode, true
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}
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}
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return nil, false
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}
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func generateTaskID() string {
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rand.Seed(time.Now().UnixNano())
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const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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var result strings.Builder
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for i := 0; i < 8; i++ {
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result.WriteByte(charset[rand.Intn(len(charset))])
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}
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return result.String()
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}
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func processNode(w http.ResponseWriter, r *http.Request, task *Task, tm *TaskManager) {
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for {
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log.Printf("Processing taskID: %s, Current Node: %s", task.ID, task.CurrentNodeID)
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node, exists := tm.graph.Nodes[task.CurrentNodeID]
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if !exists {
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http.Error(w, "Node not found", http.StatusInternalServerError)
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return
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}
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result := node.ProcessTask(context.Background(), task)
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log.Printf("Node %s processed. Next NodeID: %s", task.CurrentNodeID, result.NextNodeID)
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if node.GetNodeType() == PageType {
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contentWithTaskID := strings.ReplaceAll(result.Message, "{{taskID}}", task.ID)
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fmt.Fprintf(w, contentWithTaskID)
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return
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}
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if result.Error != nil {
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http.Error(w, result.Error.Error(), http.StatusInternalServerError)
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return
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}
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if result.NextNodeID == "" {
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log.Printf("Task %s completed. Final result: %s", task.ID, task.FinalResult)
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fmt.Fprintf(w, "<html><body><h1>Process Completed</h1><p>%s</p></body></html>", task.FinalResult)
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return
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}
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task.CurrentNodeID = result.NextNodeID
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tm.UpdateTask(task)
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if nextNode, nextExists := tm.graph.Nodes[result.NextNodeID]; nextExists && nextNode.GetNodeType() == PageType {
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log.Printf("Redirecting to next page: %s", result.NextNodeID)
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http.Redirect(w, r, fmt.Sprintf("/render?taskID=%s", task.ID), http.StatusFound)
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return
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}
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}
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}
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func renderHandler(w http.ResponseWriter, r *http.Request, tm *TaskManager) {
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taskID := r.URL.Query().Get("taskID")
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task, exists := tm.GetTask(taskID)
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if !exists {
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http.Error(w, "Task not found", http.StatusNotFound)
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return
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}
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processNode(w, r, task, tm)
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}
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func submitHandler(w http.ResponseWriter, r *http.Request, tm *TaskManager) {
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taskID := r.URL.Query().Get("taskID")
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task, exists := tm.GetTask(taskID)
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if !exists {
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http.Error(w, "Task not found", http.StatusNotFound)
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return
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}
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err := r.ParseForm()
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if err != nil {
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http.Error(w, "Failed to parse form data", http.StatusBadRequest)
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return
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}
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task.Inputs = make(map[string]string)
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for key, values := range r.Form {
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if len(values) > 0 {
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task.Inputs[key] = values[0]
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}
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}
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nextNodes, exists := tm.GetNextNode(task)
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if !exists {
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log.Printf("Task %s completed. Final result: %s", task.ID, task.FinalResult)
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fmt.Fprintf(w, "<html><body><h1>Process Completed</h1><p>%s</p></body></html>", task.FinalResult)
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return
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}
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switch nextNodes := nextNodes.(type) {
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case *PageNode:
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task.CurrentNodeID = nextNodes.ID
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case *FunctionNode:
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task.CurrentNodeID = nextNodes.ID
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}
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fmt.Println(task.CurrentNodeID)
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processNode(w, r, task, tm)
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}
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func startTaskHandler(w http.ResponseWriter, r *http.Request, tm *TaskManager) {
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task := tm.StartTask()
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http.Redirect(w, r, fmt.Sprintf("/render?taskID=%s", task.ID), http.StatusFound)
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}
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func isValidEmail(email string) bool {
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return true
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}
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func isValidPhone(phone string) bool {
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return true
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}
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func verifyHandler(w http.ResponseWriter, r *http.Request, tm *TaskManager) {
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taskID := r.URL.Query().Get("taskID")
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if taskID == "" {
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http.Error(w, "Missing taskID", http.StatusBadRequest)
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return
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}
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task, exists := tm.GetTask(taskID)
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if !exists {
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http.Error(w, "Task not found", http.StatusNotFound)
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return
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}
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task.Inputs["email_verified"] = "true"
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log.Printf("Email for taskID %s successfully verified.", task.ID)
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nextNode, exists := tm.graph.Nodes["dashboard"]
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if !exists {
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http.Error(w, "Dashboard node not found", http.StatusInternalServerError)
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return
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}
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result := nextNode.ProcessTask(context.Background(), task)
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if result.Error != nil {
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http.Error(w, result.Error.Error(), http.StatusInternalServerError)
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return
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}
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contentWithTaskID := strings.ReplaceAll(result.Message, "{{taskID}}", task.ID)
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fmt.Fprintf(w, contentWithTaskID)
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}
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func main() {
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graph := NewGraph()
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tm := NewTaskManager(graph)
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customRegistrationNode := &PageNode{
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ID: "customRegistration",
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Content: `<html><body><h1>Custom Registration</h1><form method="POST" action="/submit?taskID={{taskID}}"><label>Email: </label><input type="text" name="email"><br><label>Phone: </label><input type="text" name="phone"><br><label>City: </label><input type="text" name="city"><br><input type="submit" value="Submit"></form></body></html>`,
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}
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checkValidityNode := &FunctionNode{
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ID: "checkValidity",
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Func: func(task *Task) Result {
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email, phone := task.Inputs["email"], task.Inputs["phone"]
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if !isValidEmail(email) || !isValidPhone(phone) {
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return Result{
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NextNodeID: "customRegistration",
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Message: "Invalid email or phone number. Please try again.",
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}
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}
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return Result{NextNodeID: "checkManualVerification"}
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},
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}
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checkManualVerificationNode := &FunctionNode{
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ID: "checkManualVerification",
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Func: func(task *Task) Result {
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city := task.Inputs["city"]
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if city != "Kathmandu" {
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return Result{NextNodeID: "manualVerificationPage"}
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}
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return Result{NextNodeID: "approveCustomer"}
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},
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}
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approveCustomerNode := &FunctionNode{
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ID: "approveCustomer",
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Func: func(task *Task) Result {
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task.FinalResult = "Customer approved"
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return Result{NextNodeID: "sendVerificationEmail"}
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},
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}
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sendVerificationEmailNode := &FunctionNode{
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ID: "sendVerificationEmail",
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Func: func(task *Task) Result {
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return Result{NextNodeID: "verificationLinkPage"}
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},
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}
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verificationLinkPageNode := &PageNode{
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ID: "verificationLinkPage",
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Content: `<html><body><h1>Verify Email</h1><p>Click here to verify your email</p><a href="/verify?taskID={{taskID}}">Verify</a></body></html>`,
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}
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dashboardNode := &PageNode{
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ID: "dashboard",
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Content: `<html><body><h1>Dashboard</h1><p>Welcome to your dashboard!</p></body></html>`,
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}
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manualVerificationNode := &PageNode{
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ID: "manualVerificationPage",
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Content: `<html><body><h1>Manual Verification</h1><p>Please verify the user's information manually.</p><form method="POST" action="/verify?taskID={{taskID}}"><input type="submit" value="Approve"></form></body></html>`,
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}
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verifyApprovedNode := &FunctionNode{
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ID: "verifyApproved",
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Func: func(task *Task) Result {
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return Result{NextNodeID: "approveCustomer"}
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},
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}
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denyVerificationNode := &FunctionNode{
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ID: "denyVerification",
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Func: func(task *Task) Result {
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task.FinalResult = "Verification Denied"
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return Result{NextNodeID: "verificationLinkPage"}
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},
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}
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graph.AddNode(customRegistrationNode)
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graph.AddNode(checkValidityNode)
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graph.AddNode(checkManualVerificationNode)
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graph.AddNode(approveCustomerNode)
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graph.AddNode(sendVerificationEmailNode)
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graph.AddNode(verificationLinkPageNode)
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graph.AddNode(dashboardNode)
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graph.AddNode(manualVerificationNode)
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graph.AddNode(verifyApprovedNode)
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graph.AddNode(denyVerificationNode)
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graph.AddEdge("customRegistration", "checkValidity")
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graph.AddEdge("checkValidity", "checkManualVerification")
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graph.AddEdge("checkManualVerification", "approveCustomer")
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graph.AddEdge("checkManualVerification", "manualVerificationPage")
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graph.AddEdge("approveCustomer", "sendVerificationEmail")
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graph.AddEdge("sendVerificationEmail", "verificationLinkPage")
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graph.AddEdge("verificationLinkPage", "dashboard")
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graph.AddEdge("manualVerificationPage", "verifyApproved")
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graph.AddEdge("manualVerificationPage", "denyVerification")
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graph.AddEdge("verifyApproved", "approveCustomer")
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graph.AddEdge("denyVerification", "verificationLinkPage")
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http.HandleFunc("/start", func(w http.ResponseWriter, r *http.Request) {
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startTaskHandler(w, r, tm)
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})
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http.HandleFunc("/render", func(w http.ResponseWriter, r *http.Request) {
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renderHandler(w, r, tm)
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})
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http.HandleFunc("/submit", func(w http.ResponseWriter, r *http.Request) {
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submitHandler(w, r, tm)
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})
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http.HandleFunc("/verify", func(w http.ResponseWriter, r *http.Request) {
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verifyHandler(w, r, tm)
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})
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fmt.Println("Server starting on :8080...")
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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